Does the Earth's magnetic field daily changes affect plant germination and
growth?

Although there is a tremendous popular interest in magnetic fields...and the
health 'risks' or electromagnetic fields, I have never heard of a study that
conclusively shows that magnetic fields..or changing magnetic fields...affect
plant growth AT THE LEVELS FOUND IN THE NATURAL ENVIRONMENT. Powerful local
magnetic fields created artificially can suck car keys out of your pockets,
and these kinds of fields can probably cause all kinds of biological changes.
But the fields found in nature at the scale of your backyard garden, are
way too weak to do much at all that makes a difference. If you know of any
study that says otherwise, let me know!!!